Web-cutting mechanism



Painted my. as, i930 UNITED STATES PATENT oFFlcE AUGUST BA-'UIYIGAR'IN'ER, 0111"y HOLLIS, NEW YORK, ASSIGNOR TO R. HOE 8c C0., INC., OF NEW YORK, 2N'. Y., A CORPORATION OF NEW YORK WEB-CUTTING- MECHANISM Application led .Tune 30, 1928. Serial No. 289,562.

This invention relates to cutting mechanism and has been designed particularly for use with rotary cutters employed for cutting a continuous web of paper into sheets with a shear cut, leaving clean cut edges, although the invention may if desired, be used with other forms of cutting mechanism.

It is the special object of the invention to provide an improved construction for disengaging the end of the web from the cutters, and for directing it in the path -provided so that there will be no.. catching of the end against the cutters or deflection of it out of its proper path after the cut.

Vith the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts, and in the details of construction hereinafter described and claimed, it being understood that various changes in the precise embodiment of the invention herein disclosed may be madewithin the scope of what is claimed without departing from the spirit of the invention.

The invention has been illustrated in its preferred formin the accompanying drawings, wherein A 'i Figure 1 is a fragmentary view partly 1n section. showing parts of a pair of cutting cylinders to which the invention is applied;

Figure 2 is a view similar to Figure 1 but showing the relative position of the parts after they have moved forward somewhat in their cycle of operation;

Figure 3 is a View taken in the direction of arrow 3 of Figure 2, partly broken away and showing the face or top of the backing plate which is the subject of the invention; ,g

VFigure 4 is a fragmentary sectional view of a portion of one of the cutting cylinders showing a modified form of cutting knife embodying the invention.

Referring to the drawings the cutting knives 11 and 12 are held in suitable recesses in the cutting cylinders 13 and 14, by means of bolts 15. A brush 16 is held in the cylinder 13 close beside the knife 11 and a backing plate 17 which is the subject of the present .invention is secured to the cylinder- 14 so that its leading edge overlaps the knlfe 12.

The cylinders, are rotated by suitable means, in the direction indicated by the arv rows and the knives coact with each other in a well known manner to sever the web 18 into sheets as it passes between them. A portion of one of these sheets is shown at 19.

In order Ito provide an adjustment for properly setting the knives they are beveled on their rear edges as shown and are engaged by pointed screws 20. It will be understood that the knives canbe forced outward by tightening the screws and locked in position by the bolts 15.

A. set of guides 21 and 22 o1' which there may be-.several lengthwise 0f the Cylinder, serve to direct the cut sheets to the folding and delivery mechanism `not shown.

W en the web is cut there is a tendency for the new end to catch on the knife 11 and be carried around the cutting cylinder instead of passing on between the guides 21 described inthe U. S. Patent No. 1,273,368

granted to A. E. Hilton on July 23, 1918. It has been found that while the brush satisfactorily disengages the end of the web lfrom the leading knife 11, there is a tendency for it to catch on the trailing knife 12. The backing plate 17 overcomes this tendency by pressing the new end of the web away fron the-knife 12. l f

Backing plates have been used heretofore as shown in the Hilton patent but they did not always prevent the new end of the web from catching on the knife 12, and it was found necessary to insert a folded stripof cardboard or other material under the backing plate with the edge projecting, to press the end of the web away from the knife. These strips however required frequent replacement and were otherwise unsatisfactory. The backing plate herein shown constitutes a projecting member that extends radially beyond the knife and is provided with grooves 23 positioned to clear the guides 22. It will thus be seen that the rotation of the cylinder causes the end of the web to be pressed away from the knife and directed between the guides as shown in Figure 2.

In Figure 4 a modified form of the invention is shown, in which the separate backing plate 17 is omitted, and the same result is obtained by forming the trailing knife 12 With an extended rear portion 24, which in effect, forms a backing plate integral with the knife 12. It Will be understood that this portion of the knife is cut away to the dotted line 23 in the same manner as in the backing plate 17' in order that it may pass the ends of the guides 22.

What I claim is:

1. In a mechanism for cutting a Web into sheets, a rotary cutting device, comprising a cutting cylinder carrying a leading knife and a cutting cylinder carrying a trailing knife, which cutting cylinders co-act to cut the Web, sheet guides, means to disengage the end of the Web from the leading knife, and a projecting member associated' With the trailing knife having openings arranged to pass the sheet guides, said projecting member being adapted to disengage the end of the web from the trailing knife and `direct it between the sheet guides.

2. In a mechanism for cutting a Web into sheets, a rotary cutting device, comprising a cutting cylinder carrying a leading knife and a cutting cylinder carrying a trailing knife, which cutting cylinders co-act to cut the web, sheet guides, means to disengage the end of the web from the leading knife, and means associated with the trailing knife and coacting with the sheet guides to disengage the end of the web from the trailing knife and direct it between the sheet guides, said means comprising a backing plate having a projecting member with openings therein in alignment with the sheet guides.

3. In a mechanism for cutting a web into sheets, a rotary cutting device, comprising a cutting cylinder carrying a leading knife and a cutting cylinder carrying a trailing knife, which cutting cylinders co-act to cut the web, sheet guides, a brush adjacent the leading knife and adapted to disengage the end ofthe web therefrom, and a projecting member closely adjacent the cutting edge of the trailing knife to disengage the end of the web therefrom, said rojecting member extending farther outsi e the cylinder than the trailing knife and having transverse grooves adapted to pass over the ends ofthe sheet guides.

AIn testimony whereof, I affix my signature.

AUGUST BAUMGARTNER. 

